Mystery solved ,it is all down to a miss-shaped rear tyre ,that will teach me to buy budget tyres !!
I was just about to post and say check the tyres...I had the same thing 2 years ago, drove me nuts trying to solve...My old skool MOT chap was the one to spot the issue.


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I had an issue with a P4 pulling to one side, again a old MoT chap suggested the tyres and was right. Those were Avons , one tyre case was askew